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This invited talk will review a series of our recent studies on high-entropyceramics (HECs) and compositionally complex ceramics (CCCs) and discuss thefuture perspective. Various single-phase equimolar quinary (five-component)HECs, e.g., MB2, MB, M3B4, MB4, and MB6 borides, MSi2 and M3Si5 silicides,perovskite, fluorite, and pyrochlore oxides, and (intermetallic) aluminideshave been fabricated. We further proposed to extend HECs to CCCs to includenon-equimolar compositions and further consider short- and long-range orders,which reduce configurational entropies but offer additional dimensions andopportunities to tailor and improve various properties. We also reported thefirst dual-phase HECs/CCCs. Using compositionally complex fluorite-based oxides(CCFBOs, which can possess fluorite or defect fluorite, pyrochlore, weberite,fergusonite, and bixbyite phases) as the model systems, we have recentlydiscovered long- and short- range orders, composition- and redox-inducedorder-disorder transitions (ODTs), and ultrahigh-entropy weberite andfergusonite phases in several 10- to 21-component systems.

From High-Entropy Ceramics (HECs) to Compositionally Complex Ceramics (CCCs)